Thomas Gleixner | 1802d0b | 2019-05-27 08:55:21 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2013 - Virtual Open Systems |
| 4 | * Author: Antonios Motakis <a.motakis@virtualopensystems.com> |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/slab.h> |
| 9 | #include <linux/vfio.h> |
| 10 | #include <linux/platform_device.h> |
| 11 | |
| 12 | #include "vfio_platform_private.h" |
| 13 | |
| 14 | #define DRIVER_VERSION "0.10" |
| 15 | #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>" |
| 16 | #define DRIVER_DESC "VFIO for platform devices - User Level meta-driver" |
| 17 | |
Sinan Kaya | b5add54 | 2016-07-19 09:01:47 -0400 | [diff] [blame] | 18 | static bool reset_required = true; |
| 19 | module_param(reset_required, bool, 0444); |
| 20 | MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)"); |
| 21 | |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 22 | /* probing devices from the linux platform bus */ |
| 23 | |
| 24 | static struct resource *get_platform_resource(struct vfio_platform_device *vdev, |
| 25 | int num) |
| 26 | { |
| 27 | struct platform_device *dev = (struct platform_device *) vdev->opaque; |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 28 | |
Andy Shevchenko | feaba59 | 2020-12-09 22:36:39 +0200 | [diff] [blame] | 29 | return platform_get_mem_or_io(dev, num); |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 30 | } |
| 31 | |
| 32 | static int get_platform_irq(struct vfio_platform_device *vdev, int i) |
| 33 | { |
| 34 | struct platform_device *pdev = (struct platform_device *) vdev->opaque; |
| 35 | |
Eric Auger | 723fe29 | 2020-03-24 09:26:30 -0600 | [diff] [blame] | 36 | return platform_get_irq_optional(pdev, i); |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | static int vfio_platform_probe(struct platform_device *pdev) |
| 40 | { |
| 41 | struct vfio_platform_device *vdev; |
| 42 | int ret; |
| 43 | |
| 44 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); |
| 45 | if (!vdev) |
| 46 | return -ENOMEM; |
| 47 | |
| 48 | vdev->opaque = (void *) pdev; |
| 49 | vdev->name = pdev->name; |
| 50 | vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM; |
| 51 | vdev->get_resource = get_platform_resource; |
| 52 | vdev->get_irq = get_platform_irq; |
Sinan Kaya | b5add54 | 2016-07-19 09:01:47 -0400 | [diff] [blame] | 53 | vdev->reset_required = reset_required; |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 54 | |
| 55 | ret = vfio_platform_probe_common(vdev, &pdev->dev); |
Jason Gunthorpe | cb61645 | 2021-03-30 09:53:06 -0600 | [diff] [blame] | 56 | if (ret) { |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 57 | kfree(vdev); |
Jason Gunthorpe | cb61645 | 2021-03-30 09:53:06 -0600 | [diff] [blame] | 58 | return ret; |
| 59 | } |
| 60 | dev_set_drvdata(&pdev->dev, vdev); |
| 61 | return 0; |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | static int vfio_platform_remove(struct platform_device *pdev) |
| 65 | { |
Jason Gunthorpe | cb61645 | 2021-03-30 09:53:06 -0600 | [diff] [blame] | 66 | struct vfio_platform_device *vdev = dev_get_drvdata(&pdev->dev); |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 67 | |
Jason Gunthorpe | cb61645 | 2021-03-30 09:53:06 -0600 | [diff] [blame] | 68 | vfio_platform_remove_common(vdev); |
| 69 | kfree(vdev); |
| 70 | return 0; |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | static struct platform_driver vfio_platform_driver = { |
| 74 | .probe = vfio_platform_probe, |
| 75 | .remove = vfio_platform_remove, |
| 76 | .driver = { |
| 77 | .name = "vfio-platform", |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 78 | }, |
Lu Baolu | 70693f4 | 2022-04-18 08:49:56 +0800 | [diff] [blame] | 79 | .driver_managed_dma = true, |
Antonios Motakis | 9df85aa | 2015-03-16 14:08:43 -0600 | [diff] [blame] | 80 | }; |
| 81 | |
| 82 | module_platform_driver(vfio_platform_driver); |
| 83 | |
| 84 | MODULE_VERSION(DRIVER_VERSION); |
| 85 | MODULE_LICENSE("GPL v2"); |
| 86 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 87 | MODULE_DESCRIPTION(DRIVER_DESC); |